单项选择题

In those early days, the boy company's（）business was model railways and cars.

A. useful
B. full
C. easy
D. core

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She（）mail the package before the post office closes.

A. has
B. have to
C. has to
D. must to

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The seller was trying to sign a substantial order（）

A. that is made with certain conditions.
B. that you have finalized the delivery dates.
C. then he could get a large discount.
D. to be more flexible over terms of payment.

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They look forward to（）the new products soon.

A. saw
B. see
C. seeing
D. to see